There are two ways to categorize pages: category or tags. Each as their own pros and cons.
In order to setup a category, each page must be named using the following syntax category:page-name. For example, I can create an American:Rules, American:Overview, etc. In order to find all American pages, we can do a System:American page to display all of them.
The downside to this is that mahjong shares similar elements with one another. Take Thirteen Orphans, Nine Gates, All Green. These are common limit hands that belong to more than one category (i.e. appears in World Series, Chinese Official, Japanese Riichi, etc). How would we organize this then? One idea is to leave theses pages un-categorized altogether. The same problem will occur with general mahjong topics and strategy.
Tags are an easy way to find all pages label with a certain field. This would solve our pages that fit in more than one category. Problem: you'll notice tags are separated by spaces. (Which genius didn't think of comma separated tags?) Thus, we cannot have a "Chinese Official" tag. This is problematic because we have "Chinese Classical", "Japanese Classical", "Japanese Modern", etc. How would the tags distinguish between the two?
What are your thoughts on wiki organization?